"Lazarus" or "Eleazar"

[Charles Wilson]

I look forward to your follow-ups!
In John 18:15, Papyrus 66* has a minus of:

ὁ δε μαθητης εκεινος ην γνωστος τῳ αρχιερει
the other disciple was an acquaintance of the high priest

That is, this piece of text is missing in P66*.
In the next verse it differs from other Greek witnesses like this:

P66*: εξηλθεν  ουν  ὁ  μαθητης                 ὁς ην  γνωτος  του  αρχιερεως  και  ειπεν  τῃ  θυρῳ
P66*: So, went out the disciple,            who was kinsman to the high priest and spoke to the door
א:     εξηλθεν  ουν  ὁ  μαθητης  ὁ  αλλος  ὁς ην  γνωστος  τῳ  αρχιερει  και  ειπεν  τῃ  θυρουρῳ
א:    So, went out the other disciple, who was known to the high priest and spoke to the door keeper

γνωτός, as far as I know, does not occur anywhere else in the mainstream Greek Bible. Its sense overlaps to an extent with γνωστός, so if this text was composed in Aramaic, they could translate the same word.

P66* gives more information than the others here: "who was kinsman to the High Priest".

"Kinsman" is a Technical Term.  It does not imply familial relationship.  It is reflective of Greek Court Ordering.
A. H. M. Jones, The Herods of Judaea:

" As he replaced the sacerdotal Sanhedrin by a secular council, so Herod built up to replace the old hereditary aristocracy a new aristocracy of service whose members should owe their rank and their wealth to him and to him alone. They were graded according to regular Hellenistic practice in progressive ranks of dignity, "the friends" being the lowest, then "the most honoured friends", then "the guards of the body", and finally "the kinsmen"; the last title, it may be noted, was like others purely honorific and implied no real relationship..."  

See also: Josephus, War..., 1, 23, 5.
See also: "The Banquet", where you sit with your "Friends" at the social lower end of the Banquet Table until you are asked to "Move Up" so that you may be "Honored" by your "Friends".

Herod ordered the Court along Greek Lines and P66* - if taken to its Logical Conclusion - implies that the High Priest and the High Priest Apparatus was at least describable by this Greek Ordering.  The phrase "Acquaintance of the High Priest" moderates and possibly deflects the meaning and relationships here.

The High Priest Apparatus knows Jesus and Peter (Simon Peter figures in as well...).  The "Gallilean Accent" of Peter is Historical.  The Hasmoneans gave Settlements in Galilee to the 24 Mishmarot Groups.  We would expect this.

In short, the events appear to be Historical ("Possible", "Probable", "Definite": Season to taste.).  Details may be Literary but the H P Apparatus operates as we would expect.
P66* is of great help here.  John gives us details not found in the Synoptics and these details change the Story.

Thanx, sestir.